Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8894b&link_type=abstract
HST Proposal ID #8894
Computer Science
Hst Proposal Id #8894
Scientific paper
We propose to perform UB-band imaging of the Orion Nebula Cluster in order to derive for the first time the disk accretion rates of the pre-main-sequence objects, and to study with unprecented resolution and sensitivity the dark silhouette disks. Since for 1000 stars the spectral types and extinction are known, WFPC2 images in the 330W filter will directly provide the U-band excesses. It has been shown recently that the U-band excess is strongly correlated with the disk accretion luminosity, and therefore with the accretion rate. We will compare the accretion rates with the stellar parameters, measured or derived by matching the source positions in the HR diagram with theoretical evolutionary tracks, and with the IR excesses. Correlations with quantities like mass, age, position, etc. will provide fundamental insights on the star formation process in Orion. The database of accretion rates will be the richest ever built for this class of phenomena. The dark silhouette disks of the Orion Nebula will be studied exploiting the simultaneous increase of spatial resolution and dust extinction in the U-band. A higher sensitivity to lower column densities will not only improve our understanding of these objects {density distribution, truncation, etc.} but also enable the discovery of fainter silhouette disks, possibly in a more evolved evolutionary phase.
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